An average American spends 30 minutes a day waiting in a line. They also drive for 5/3 hours, eat for 5 quarters of an hour, and talk on the phone for 83 minutes every day. If they spend 1/x of their lifetime on waiting in a line, driving, eating, or talking on the phone, what is the value of x?

A day has 1440 minutes, so

1/x = (30 + 5/3*60 + 5/4*60 + 83)/1440 = 288/1400 = 1/5